There are 10 cards in the series, and you can earn three cards per day by enter a tile from the Saliens game that was released alongside the sale. You will also earn a card each time you use your Discovery Queue, up to 3 times per day. You can also earn cards by crafting a badge from any other card set - doing so will give you one card at random in addition to the normal badge crafting rewards. Additionally each $10 spent from buying games will grant you one card.